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Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2018
Accounting Policies [Abstract] |
Schedule of New Accounting Pronouncements and Changes in Accounting Principles | The March 31, 2017, accompanying condensed consolidated statements of operations (“accompanying statements of operations”) line items that were adjusted as a result of the adoption of ASU 2017-07 are summarized as follows:
| For the Three Months Ended March 31, 2017
| As Reported |  | As Adjusted
| (in thousands)
Operating expenses: |  |  |
Exploration | $ | 11,978 |  |  | $ | 11,817 |
General and administrative | $ | 29,224 |  |  | $ | 28,817 |
Total operating expenses | $ | 207,145 |  |  | $ | 206,577 |
Income from operations | $ | 165,593 |  |  | $ | 166,161 |
Other non-operating income (expense), net | $ | 335 |  |  | $ | (233 | )
The accompanying condensed consolidated statements of cash flows (“accompanying statements of cash flows”) line items that were adjusted as a result of the adoption of ASU 2016-15 and ASU 2016-18 for the three months ended March 31, 2017, are summarized as follows:
| For the Three Months Ended March 31, 2017
| As Reported |  | As Adjusted
| (in thousands)
Cash flows from operating activities: |  |  |
Non-cash loss on extinguishment of debt, net | $ | 22 |  |  | N/A |
Loss on extinguishment of debt | N/A |  |  | $ | 35 |
Net cash provided by operating activities | $ | 134,966 |  |  | $ | 134,979 |
Cash flows from investing activities: |  |  |
Other, net | $ | 2,486 |  |  | N/A |
Net cash provided by investing activities | $ | 517,313 |  |  | $ | 514,827 |
Cash flows from financing activities: |  |  |
Cash paid for extinguishment of debt | N/A |  |  | $ | (13 | )
Net cash used in financing activities | $ | (2,504 | ) |  | $ | (2,517 | )
Net change in cash and cash equivalents | $ | 649,775 |  |  | N/A |
Net change in cash, cash equivalents, and restricted cash | N/A |  |  | $ | 647,289 |
Cash and cash equivalents at beginning of period | $ | 9,372 |  |  | N/A |
Cash, cash equivalents, and restricted cash at beginning of period | N/A |  |  | $ | 12,372 |
Cash and cash equivalents at end of period | $ | 659,147 |  |  | N/A |
Cash, cash equivalents, and restricted cash at end of period | N/A |  |  | $ | 659,661 |
Schedule of cash and cash equivalents, and restricted cash | The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the accompanying balance sheets:
| As of March 31, 2018 |  | As of December 31, 2017
| (in thousands)
Cash and cash equivalents | $ | 643,337 |  |  | $ | 313,943 |
Restricted cash | — |  |  | — |
Total cash, cash equivalents, and restricted cash | $ | 643,337 |  |  | $ | 313,943 |

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- Definition Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22580-107794 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22499-107794 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.10-01.(b)(6)) -URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22583-107794 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305 + Details
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